Comb plate and method of manufacturing the same



May 31, 1932. ANDls 1,860,643

' V COMB PLATE AND METHOD OF MANUFACTURING THE SAME Filed Jan. 26, 1931INVENTOR.

AITI'ORNEYS the teeth, then grinding the blade to the de- ITED STATESPATENT OFFICE MATHEW ANDIS, OF RACINE, WISCONSIN I COMB PLATE AND METHODOF MANUFACTURING- THE SAME Application filed January 26, 1931. SerialNo. 511,170.

My invention relates to improvements in comb plates for hair clippingand shaving devices and processes of manufacturing the same.

The object of my invention is to provide a comb plate in which thetoothed portion may be ground to razor-like thinness, and the extremetips of the points of the teeth provided with knobs preferably of aspherical form to prevent the points from penetrating the skin during aclipping operation.

A further object is to provide a method whereby the knobs may be formedupon the points of the teeth after the grindingoperation. From acommercial standpoint it is not possible otherwise to form such knobswithin limitations of permissible expense, but I have discovered thatbyfirst cutting sired degree of thinness, and then dipping the points ofthe teeth in metal of low fusibility, the molten metal may be made toadhere to the points of the teeth in the form of plate as it appearsafter a second dipping operatlon.

drops which solidify to form such knobs.

' In the drawings:

Figure 1 is an isometric view of a fragment of a comb plate as itappears subsequent to the milling and grinding :operation and theinitial dipping operation.

Figure 2 is a similar view showing the comb Figure 3 is a similar viewshowing the comb plate after the final dipping operation.

Figure 4 isa View of the comb plate and clipping blade as they appear inshaving assembly. y

The combplate shown in the drawings 'is of the usual form having a flatconnecting portion 10 to facilitate attachment to the clipper casing, adownwardly offset shoulder portion 11 and the blade portion 12, thelatter being milled toform grooves 13 on its under side whlchprogressively increase in depth toward the forward margin 14 of thecomb. The upper side of the plate is then ground away until the deeperportions of the groovesl3 are exposed, thereby forming teeth 15, thepoints of which are exceedingly thin, preferably about .003 to .005 inthickness, the thickness of the points of the teeth being exaggerated inthe drawings for the sake of clearness of illustration.

The margin 14: of the blade is then dipped into molten metal to a depthjust suificient to allow drops of such material to adhere to the pointsof the teeth. The blade is instantly removed to allow the adherentliquid to solidify, whereupon the operation is repeated and anadditional coating of the molten material accumulates upon the solidified surfaces. This dipping of the points of the teeth and the alternatesolidification of the adherentmaterial may, thus be repeated until knobsof the desired'diameter are produced.

Enamel (porcelain), lead, 'or other material fusing at a low temperaturerelatively to the steel of which the blade is composed may be melted andused to form the knobs in the manner above described, and by instantlyremoving the points of the teeth after immersing them in the moltenmaterial 'no injury results to the blade or its teeth through loss oftemper, distortion or otherwise. It will, of course, be understood thatthe blade will be so held that, the points of the teeth will be parallelwith the surface of the liquid during the dipping operation. Uponcompletion of the clipping operation the comb plate will be ready foruse.

It will of course be understood that these I comb plates are to be usedin connection with power driven clippers of the general type disclosedin my former Patent N 0. 1,671,265, dated May 29, 1928, in which amovable toothed blade is vibrated or rapidly reciprocated upon the uppersurface of the comb plate near the points of its teeth. When employedfor shaving purposes, the comb plate and clipper blade assembly will besupported as indicated in Figure 4, and as morefully set forth anddescribed in a companion application bearing even date herewith.

It is not material whether the knobs are completely spherical,semi-spherical or otherwise shaped, it being obvious that after formingthe spherical knobs, portions may be ground or cut away if desired. Butordinarily the spherical form will be preferred.

I claim: 7

1. A method of forming comb plates for hair clip ers consisting inpreparing a blank having e general form of the plate, milling one sidethereof to form grooves which progressively increase in depth toward onemargin, grinding the other side of the blank to remove theungroovedmaterial from the more deeply grooved marginal portion wherebya b1ade .is formed throu h which the grooves extend to provide teetalong said mar 'n, and then momentarily and repeatedly ipping the ointsof the teeth in molten material of re atively low fusibility and coolingthem in the intervals between dipping operations to provide the teethwith minute knobs composed of successive layers of material ofrelatively low fusibility without impairing the temper of the teeth.

2. The method of forming comb plates for hair clippers consisting inshaping, milling and grinding the plate to the form of a blade of thedesired thickness having milled teeth along its working margin the endportions of which teeth are of razor like thinness, dipping the extremepoints of the teeth in molten material of low fusibility, instantlyremoving the teeth and allowing the adherent material to solidify,andthen repeatin the dipping and removingloperations until knobs areproduced upon t e points of the teeth of the desired diameters, withoutimpairing the temper of the teeth.

3. A comb plate for hair clippers having 3 teeth along one marginprovided with knobs on their extremities composed of a series ofcoverings fused to ether and composed of material of relative y lowfusibility as com-' pared with the teeth.

40 4. A comb plate for hair clippers having tempered shearing teeth ofrazor-like thinness and sharpness providedwith spherically rounded knobson-their points, said knobs bein composed of multiple layers ofuntempere material.

. MATHEW ANDIS.

